cmake - fix SKIP_TESTING test in dist.cmake

Author: davidm

dist.cmake

@@ -357,8 +357,8 @@ endmacro ()
 # Under LuaDist, set test=true in config.lua to enable testing.
 # USE: add_lua_test ( test/test1.lua )
 macro ( add_lua_test _testfile )
-	if ( SKIP_TESTING )
-  	include ( CTest )
+	if ( NOT SKIP_TESTING )
+		include ( CTest )
 		find_program ( LUA NAMES lua lua.bat )
 		get_filename_component ( TESTFILEABS ${_testfile} ABSOLUTE )
 		get_filename_component ( TESTFILENAME ${_testfile} NAME )